The food chain is the description of the energy flow between the producers and the consumers. In the given food chain, the grass is the producer. Thus, option A is correct.
What is a food chain?
In ecology, the food chain depicts the transfer of energy and matter from one level to another through different organisms. The food chain makes the food web and interconnects many organisms together.
The grass is the producer as it is the base of the food chain that produces food and hence are autotrophs that are called the producers. The mouse, snake, and hawk are the primary, secondary and tertiary consumers, respectively.
Therefore, the grass is the producer.
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